| Term: | Surface freezing index |
| Definition: |
The cumulative number of degree-days below 0 degrees Celsius for the surface temperature (of the ground, pavement, etc.) During a given time period. NSIDCCryosphere
The cumulative number of degree-days below 0˚C for the surface temperature (of the ground, pavement, etc.) during a given time period IPAPermafrost GCW |